Improvement relating to weighing apparatus



July 26, 1932. w. TlMsoN IMPROVEMENT RELATING TO WEIGHING APPARATUS Filed Aug. 25, 1930 WILLIAM TIMsoN,

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Patented July 26, 1932 i UNITED STATES PATENT orsi IMPROVEMENT RELATING TO WEIGI-IING APPARATUS Application filed August 25, 1930, Serial No. 477,602, and in Great Britain. September 4, 1929.

This invention has reference to improvements 1n or relating to means for use 1n conjunction with` the printing mechanism of.

weighing apparatus for preventing a printing operation being effected except when the apparatus is in equilibrium.

The invention consists of an improved means for use in conjunction with the printing mechanism of weighing apparatus for preventing a printing operation being effected except when the apparatus is in equi librium, characterized in that the actuating lever or the like of the printing mechanism cO-operates with a locking means which is `connected to and governed by a-dashpot controlled member adapted to be inuenced by a movement of the weighing mechanism whereby when theapparatus is out of equilibrium the movements transmitted through the dashpot to the said member are caused to move the locking means so as to obstruct and prevent the actuation of the aforesaid lever or the like. v

` The invention further resides in the details to be described hereinafter.

l The invention will now be described with particular reference to the accompanying sheet of drawing which illustrates the invention in its application to a weighing scale of known construction which employs a rotatable disc indicator carrying an annular type ring and which incorporates a printing mechanism of the kind described and claimed in the specification of myapplica'tionl Serial No. 335,967 dated 29th Januaryl929;

In the drawing Figure 1 is a part sectional front elevation of so much of the weighing scale as is necl` essary to an understanding of this invention and shows the printing mechanism and controlling means therefor in accordance with the invention inthe position which permits a printing operation to be effected.

Figure 2 is a detail view showing the way in which the printing lever is prevented from movement when the weighing mechanism is not in equilibrium.

The printing lever 3 is formed with an inwardly directed extension 3 which is provided adjacent to the end thereof with a hor izontally disposed projection in the form of a'square peg 3l. yThe peg is adapted, when the scale is in equilibrium, to be capable of working freely ina substantially vertically disposed arcuate slot la formed in the longer and upstanding arm of a bell crank lever 4 which is pivotally mounted at `5a in a bracket 5 supported from the scale'housing G. At'its 'lower end the slot la is formed with a neck lb the width of which is only slightly greater than the width of the peg 3b said` neck opening out into a substantially horizontally disposed slot llc. rThe shorter arm 4d of the bell crank lever 4 has pivotal connection to the longer arm of an uneven armed lever 2" fulorumed at 5b in bearings carried by the bracket 5. The shorter arm of the lever 7 has pivotal connection to the piston rod y8 carrying the piston 9 of a dashpot the cylinder lO .wherefor is carried by a bracket ll secured to the check arm l2 of the weighing apparatus, the check arm being a moving member connected in known manner to the lever system.

The dashpot is auxiliary to the ordinary dashpot (not shown) employed for damping the motion of the weighing mechanism and the dashp'ots are lpreferably adjusted initially so that there is a lag between the auxiliaryvdashpot and the main dashpot.

Theoperation of the invention is as follows Y V f Subsequent to the placing of an articlefto be weighed on the goods pan and prior to the indicatingl mechanism comingto rest, any movement of the scale pan which takes place is transmitted through the. check arm l2 to the cylinder l0 of thedashpot and occasions a Amovement of the piston 9 which piston OF SOHO-FOUNDRY, BIRMINGHAM, ENGLAND, ASSIGNOR T0 W. 'I'. AVERY, LIMITED, OF BIRMINGHAM, ENGLAND through the rod 8 and lever 7 rocks the bell crank lever 4i and moves the arcuate A:slot l therein out of register with the vprojection 3b Y now pass through the neclr ib into the arcu specification it will be appreciated that it,y

is capable of being embodied equally well with other analogous forms 'of printing mechanism for use with wei Ohing apparatus.

It will be appreciated that there is no direct connection between the weighing mechanism and the counterbalanced lever and that the lag between the main dashpot andV the air dashpot provides an additional sateguard that equilibrium shall be obtained before a printing operation can be eected.

What I claim is 1. A means Jfor use in conjunction with the printing mechanism of weighing apparatus for preventing a printing operation being effected except when the apparatus is in equilibrium'comprising an actuating member for the printing mechanism, a locking means for said member, a dashpet one part whereof is connected to and movablevwith a moving member of the weighing mechanism and the other part whereof is connected to and` movable with. the aforesaid locking ,means, whereby when the apparatus is out of equilibrium the movement of one part of the dashpot influences the other part oi the da-shpot and causes the said means to be moved into an obstructing position'relatively to the actuating member and thereby preventing the operation of the said member.

2. A means for use in conjunction with the printing mechanism of weighing apparatus or'preventing a printing operation being eected except when the apparatus is in equilibrium, comprising an actuating member tor the printing mechanism, a loci ing lever, a projection carried by the actuating member, a slot formed in said locking lever and within which the projection is adapted to worlr freelyl when the actuating member is being operated said slot being in registry with the projection and thus permitting of the entry of the projection thereinto only when the weighing apparatus is in equilibrium, a dashpot means for transmitting any movement or" the weighing mechanism to the said lever whereby the slot is moved out of registry with the projection whenever the apparatus is out ot equilibrium so as to prevent operation ofthe actuating member when the weighing` apparatus is in the last mentioned condition.

3. A means for use in conjunction Ywith the printing mechanism of weighing apparatus for preventing a printing operation being effected except when the apparatus is in equilibrium, comprising an actuating member, a lever, a slot formed in said lever having a narrow neck and laterally extending portions at the end adjacent tothe neck, a projection on the-'actuating member adapted to work freely in the aforesaid slot when the actuating member is being operated, said neckbeing in registry with the projection so as to permit o1 the entry of the said projection thereinto only when the weighing apparatus is in equilibrium, a dashpot one part whereof is connected to a moving member of the Weighing apparatus and the other part whereof has connection with the aforesaid lever whereby in the event of any movement of the weighing apparatus, as obtains when the apparatus is out of equilibrium, is transmitted to the lever whereby the neck of the slot is moved out of registry with the proj ection on the actuating member for preventing the operation Vof the said actuating member when the weighing apparatus is in the last mentioned conditionl il. A means for use in conjunction with the printing mechanism of weighing apparatus for preventing a printing operation being effected efrceptwhen the apparatus is in equilibrium, comprising a printing lever, a locking lever having an arcuately shaped slot therein, a projection onthe printing lever adapted to be in registry with the said slot when thev weighing apparatus is in equilibrium and to enter and work within said slot so as to admit of the operation of the printing lever when permitted, a dashpot having connection with a moving part of the weiglr ing apparatus and with the locking lever whereby any movement of the weighing apparatus as obtains when the apparatus is out of equilibrium is transmitted to the locking lever so as to move the slot out of registry with the projection on the printing lever and to prevent the operation thereof so long as any movement of the weighing apparatus obtains.

vIn testimony whereof, I have signed vmy name to this specification.

WILLIAM TIMSON.

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